Please find an updated ebuild for dev-ruby/gruff for version 0.1.2. No changes to the ebuild were needed compared to version 0.1.1 currently in portage, but I did add the ~amd64 keyword as I am using this gem on amd64 myself.
Created attachment 93730 [details] gruff-0.1.2.ebuild
The ebuild looks OK to me. I've tested it on x86 and it works like a charm.
Added to CVS. Thanks.